/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.netbeans;

import java.util.concurrent.atomic.AtomicBoolean;

public class NbExit {

    private static final AtomicBoolean officialExit = new AtomicBoolean(false);

    /**
     * Calls {@link System#exit(int)} exactly once and won't block when called
     * from another thread (e.g shutdown hook) again.
     */
    public static void exit(int status) {
        if (officialExit.get()) {
            return; // already inside a shutdown hook
        }
        if (officialExit.compareAndSet(false, true)) {
            System.exit(status);
        }
    }

    public static boolean isExiting() {
        return officialExit.get();
    }

}
